clear
//
//
//

//Variable declaration
d=2                   //diffraction observed(m)
lamda=500*10**-9      //wavelength(m)
a=1.5*10**-3          //slit width(m)

//Calculation
w=2*d*lamda/a        //width of central maxima(m)

//Result
printf("\n width of central maxima is %0.2f  mm",w*10**3)